I just completed building from this layout, so it's tested and verified, though I still need to box it up. I wanted to have all the pots on the board, as I hate loads of off-board wiring. This also means that the board is secured in place by the pots. It's pretty tight, and might test your soldering skills. I've built the Violet Ram's Head version, but it will work for all the transistor versions with a little thought. The layout was designed to fit sideways (Zvex style) in a 110x60x30 enclosure, without a battery - I don't use them. I added an extra pot 'Clip' which reduces the effect of the diodes in the first clipping stage, an example of diode warping, giving interesting variations. I originally had Si diodes in that stage, but I liked the effect better with Ge. And not a submini tube in sight! Enjoy!
(http://i210.photobucket.com/albums/bb292/frequencycentral/BigMuffLayout.jpg)
(http://i210.photobucket.com/albums/bb292/frequencycentral/000_0005-4.jpg)
Nice! I hate offboard wiring...
I'm with you, I put pots on the board whenever I can, even with vero layouts.
Sorry to say, but the lack of glass bottles disappoints me... :D
Quote from: svstee on April 17, 2009, 12:34:20 PM
Sorry to say, but the lack of glass bottles disappoints me... :D
:icon_lol: .......but at least I used mojo mushroom trannies and some vintage Ge diodes!
Where are people getting these BC208s?
Nice work! ;D
Soundclip??? (especially with the clip-pot) :icon_biggrin:
Quote from: Nitefly182 on April 17, 2009, 01:49:14 PM
Where are people getting these BC208s?
Old organ that I took apart - I have some spare if you want to trade.
Quote from: Der Groovemeister on April 17, 2009, 01:50:42 PM
Nice work! ;D
Soundclip??? (especially with the clip-pot) :icon_biggrin:
Ok, I'll do a clip of the 'Clip' when it's boxed up. :D
Quote from: frequencycentral on April 17, 2009, 12:37:11 PM
Quote from: svstee on April 17, 2009, 12:34:20 PM
Sorry to say, but the lack of glass bottles disappoints me... :D
:icon_lol: .......but at least I used mojo mushroom trannies and some vintage Ge diodes!
Metal film Rs--very un-mojo! [-X (wagging finger emoticon)
JK. That look's great, Rick--again.
Quote from: frequencycentral on April 17, 2009, 02:02:47 PM
Quote from: Nitefly182 on April 17, 2009, 01:49:14 PM
Where are people getting these BC208s?
Old organ that I took apart - I have some spare if you want to trade.
Damn. Last organ I took apart was a 70s hammond and all it had were a ton of super low gain and power silicons. Loads of caps and stuff but nothing great or worthy of desoldering or clipping out.
can you post a pic of the back of this? i have never used this type of board.
thanks,
Uh-oh, ceramic caps! The Mojo Police will be kicking down your door in the middle of the night for sure now! And with metal film instead of CC! If I were you I would leave the country! :icon_mrgreen:
JK, loving the build as always, rick!
approved by the mojo police. ceramic is what belongs in there. anything else would lessen that muff mojo :icon_mrgreen:
Rick
It's not safe out here in the solid state world!
Quick get back into your vaccum filled glass Envelope.
Hey nice job!
Do you happen to have the schematic for this with your mods?
Glen
FREQUENCYCENTRAL RAIDED BY MOJO POLICE SHOCK !!
In the early hours of Saturday 18th April 2009 the premises of frequencycentral aka Rick Holt aka Doctor Analogue was raided by Mojo Police accompanied by sniffer dogs. The Mojo Police found quantities of illegal metal film resistors and ceramic capacitors. Holt (age 964) claimed that they were for presonal use and that he had no intent to supply. He asked for several counts of uber-cool submini tube effects pedals and amplifiers to be taken into account. Sniffer dogs also found a circuit board containing a quantity of solid state semiconductors, the defendant pleaded that this was a momentary lapse which he knew was wrong but it felt good at the time, and that he intended to return to his vacuum filled glass envelope as soon as the supply of solid state semiconductors was exhausted. The case goes before the Mojo Magistrates on 17th May 2009, bail was set at £3.1415926, and Holt was told not to leave town.
(http://i210.photobucket.com/albums/bb292/frequencycentral/000_0001-8.jpg)
thats the best laugh iv'e had all week, Nice one Rick, the effect looks very nice as well especially those little button trannies.
Quote from: biggy boy on April 17, 2009, 06:04:56 PM
Do you happen to have the schematic for this with your mods?
The clip mod is just what I did here: http://www.diystompboxes.com/smfforum/index.php?topic=75715.0
Other than that I just subbed a few resistors, I have a quantity of 43K and 430K that I never seem to use, so being within 10% of the 39K and 470K in the BMVRH schematic I used them. While breadboarding this before building it I found that the 470K could be any value between 100K and 1M without much perceivable difference.
(http://i210.photobucket.com/albums/bb292/frequencycentral/000_0007-3.jpg)
(http://i210.photobucket.com/albums/bb292/frequencycentral/000_0009-4.jpg)
Which is the size the darn thing should have been in the first place, Mr. Matthews! Nice job, Rick.
Nice job as allways, so neat and tidy looking.
Glen
Where did you get those great little black transistors?
Quote from: rousejeremy on October 17, 2009, 10:09:41 PM
Where did you get those great little black transistors?
They were reclaimed from a 70's Farfisa Italian Organ. I have a few more stored away for mojo-mergencies. :icon_razz:
I bought an old transistor radio from an antique shop and there are a bunch that look just like the ones you have. Nothing is written on them though. Can't wait to rip them out and test them!
It may be a little bit off topic but what does "mojo" means?
Quote from: Vince_b on October 18, 2009, 10:59:07 AM
It may be a little bit off topic but what does "mojo" means?
"Mojo refers to a magical charm bag used in hoodoo. In modern usage it may also metaphorically refer to possessing a "magic touch" of creativity or charm."ie: everything to some people, snake oil to others........
:o Very neat and compact layout. So how about the sound sample regarding the Clip pot?
Thanks.Nice job
Quote from: FisTheGoon on October 18, 2009, 11:11:36 AM
:o Very neat and compact layout. So how about the sound sample regarding the Clip pot?
Thanks.Nice job
+1 :)
(http://i210.photobucket.com/albums/bb292/frequencycentral/BigMuffPCBLayout.jpg)
(http://i210.photobucket.com/albums/bb292/frequencycentral/BMPnP.gif)
C13 is .0047pF ???
Should that be .0047uF?
Quote from: Govmnt_Lacky on November 29, 2010, 11:16:52 AM
C13 is .0047pF ???
Should that be .0047uF?
Correct!
I improved that layout a while back, fatter traces and better spacing for the caps. I haven't had chance to verify it, so check it over before building:
(http://dl.dropbox.com/u/967492/Shaven%20Haven%20PCB.gif)
(http://dl.dropbox.com/u/967492/Shaven%20Haven%20PnP.gif)
Quote from: frequencycentral on December 06, 2009, 05:23:52 PM
(http://i210.photobucket.com/albums/bb292/frequencycentral/BigMuffPCBLayout.jpg)
(http://i210.photobucket.com/albums/bb292/frequencycentral/BMPnP.gif)
Well, I am building off of an etched board according to the layout above and I just now found that there are NO pads for R19!! :icon_evil: :icon_evil: :icon_redface:
Looks like I will be doing some improvising!
Ok... after a little improv ;D I got this wired up and boxed up. I used some 2N2222A metal can trannys that I had laying around. Sounds GREAT! I may try some lower gain transistors to see if I can mellow it out a bit.
Noob Question ALERT:
I could not help but notice that the Sustain AND Volume needed to be up in order to pass a signal. Is that a normal Muff function? Or, is that particular to THIS design?
Thanks again Rick.... TOP NOTCH! ;)
Quote from: Govmnt_Lacky on December 04, 2010, 05:51:00 PM
I could not help but notice that the Sustain AND Volume needed to be up in order to pass a signal. Is that a normal Muff function? Or, is that particular to THIS design?
I believe there should be a 1k resistor between ground and sustain pot lug 1 (missng from Rick's perf layout): This will prevent the sustain pot from muting the cicuit when set at minimum.
Quote from: nocentelli on December 04, 2010, 06:56:44 PM
I believe there should be a 1k resistor between ground and sustain pot lug 1 (missng from Rick's perf layout): This will prevent the sustain pot from muting the cicuit when set at minimum.
Thanks for the tip! ;)
So.... according to the original PCB layout, could that resistor (1K) be installed INSTEAD OF the jumper between Sustain Lug 1 and Ground? (By R21 and R9)
Have you made this mod yourself? Where did you get the idea for the resistor to ground?
The 1K is stock on BM's. But with me being a minimalist.....
Quote from: frequencycentral on December 04, 2010, 07:46:11 PM
The 1K is stock on BM's. But with me being a minimalist.....
Thanks Rick... I dont mind splurging in this case :icon_lol:
There is just something about having to turn two knobs to get one result (ala the BSIAB2 with the volume and the gain pots) that I cannot stand!
I would solder in 10 parts!!! :D
Quote from: svstee on April 17, 2009, 03:03:41 PM
Uh-oh, ceramic caps! The Mojo Police will be kicking down your door in the middle of the night for sure now! And with metal film instead of CC! If I were you I would leave the country! :icon_mrgreen:
JK, loving the build as always, rick!
Ceramic Disks have mucho mojo. They're all over inside old Fender Amps. Of course they cannot possibly sound as good as caps with brightly painted stripes.... But it's not like he's using Orange Drops or something.
Quote from: Govmnt_Lacky on December 04, 2010, 07:08:25 PM
So.... according to the original PCB layout, could that resistor (1K) be installed INSTEAD OF the jumper between Sustain Lug 1 and Ground? (By R21 and R9)
So, I just noticed that if I install a 1K resistor in place of the jumper, I will satisfy my requirement for the Sustain (according to all other muff schems) but, it will also add 1K more resistance between Tone Lug 3 and ground (from 39K to 40K).
Will this have a big influence on the output or will it be negligable?
So i just tested the new 1K and when the Sustain pot is at 12 oclock or lower there is a bad squeel! :icon_redface:
Looks like I am going to have to crack this open again and cut the trace between R21 and the 1K resistor that I put in place of the jumper. Then I need to re-establish the jumper from R21 to ground.
I'll give this a build sometime this week and report on it. The new layout looks fine with me.
It looks like a great layout, thanks Rick ;D Your contributions are always helpful.
Been reading this thread and thought I would cost the build, however I am struggling to find some 1n76a diodes, what can be substituted here?
I was thinking a 1n34a but I have very limited knowledge with these kind of things.
Quote from: Poste on December 07, 2010, 08:31:12 PM
Been reading this thread and thought I would cost the build, however I am struggling to find some 1n76a diodes, what can be substituted here?
I was thinking a 1n34a but I have very limited knowledge with these kind of things.
That is what I did! I used 1N34A for D1 and D2 and used 4148s for D3 and D4. Sounds fantastic. ;D
I would definitely recommend using Ricks newest layout (as it provides a place to install R19 and has thicker traces and larger pads.)
Also, definitely install a 1K resistor between Sustain pot Lug 1 and ground as this will keep you from having to raise the Volume AND Sustain to get an output. Just dont install it in the jumper spot like I did! :icon_redface: